The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 238
... gametophyte MEIOSIS antheridium spore prothallus where they occur in fissures and crevices of cliff faces , boulders , and talus . Acidic rocks such as granites , sand- stones , and quartzites have characteristic associations of species ...
... gametophyte MEIOSIS antheridium spore prothallus where they occur in fissures and crevices of cliff faces , boulders , and talus . Acidic rocks such as granites , sand- stones , and quartzites have characteristic associations of species ...
Page 239
... gametophyte . When the spore wall cracks under appropriate moist conditions , the fern gametophyte is formed . Emerging from the spore at the time of germi- nation are a nongreen rhizoid ( rootlike organ ) , which attaches the plant to ...
... gametophyte . When the spore wall cracks under appropriate moist conditions , the fern gametophyte is formed . Emerging from the spore at the time of germi- nation are a nongreen rhizoid ( rootlike organ ) , which attaches the plant to ...
Page 240
... gametophytes is accomplished by continued growth and fragmentation , but this does not spread the gametophyte very far . Some subfamilies ( Vittarioideae , Grammitidoideae , Hymenophylloideae ) produce specialized filaments , or gemmae ...
... gametophytes is accomplished by continued growth and fragmentation , but this does not spread the gametophyte very far . Some subfamilies ( Vittarioideae , Grammitidoideae , Hymenophylloideae ) produce specialized filaments , or gemmae ...
Contents
would become the principal reserve asset while gold | 36 |
Excretion the elimination of the waste products of | 50 |
Volumes | 431 |
Copyright | |
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acid activity amount animals appears become blood body called carried cause cells century changes chemical close common complete consists containing continuous countries depends direction early effect evidence evolution example existence farm federal ferns fibres field Figure fire function gametophyte give groups important increase interest Italy kidney known later leaves less light lines living major marriage material means ment method move movements muscle natural normal obtained occur organs origin percent period person plants position possible present pressure problems produced properties protection reduced remain renal response result retina selection similar social species structure supply surface temperature tend tion types United urine usually various vary